Tiltable cantilever X-ray table



Jan. 25, 1955 A. J. KIZAUR TILTABLE CANTILEVER X-RAY TABLE 2Sheets-Sheet l Original Filed Jan. 26. 1948 /I/ J T 342 A. J. KIZAURTILTABLE CANTILEVER X-RAY TABLE 2 Sheets-Sheet 2 Original Filed Jan. 26,1948 United States Patent THEABLE CANTILEVER X-RAY TABLE Arthur l.Kizaur, Wauwatosa, Wis., assignor to General Electric Company, acorporation of New York Original appiication January 26, 1943, SerialNo. 4,446. Divided and this application April 6, 1949, Serial No. 35,350

29 Claims. (Cl. Z50-57) The present invention relates in general tosupport tables, and has more particular reference to an improved tiltingstructure well adapted for use in supporting human bodies, selectively,in vertical, horizontal, and intermediate positions for examination, thetable structure being especially adapted for use in connection withX-ray fluoroscopic examination, and for radiographic purposes, thepresent application being a division of my co-pending application forUnited States Letters Patent for lmprovement in Table Construction,Serial No. 4,446, tiled January 26, 1948, which issued, September 18,1951, as United States Patent No. 2,568,236.

An important object of the present invention is to provide an improved,relatively light weight table structure providing adequate rigidity,including novel and simplified tilting support means adjustable to carrythe table in any desired tilted position; a further object being toprovide tilting support means adapted to carry the table in any desiredposition between horizontal and vertical positions; a further objectbeing to provide for tilting the table from horizontal to vertical in atleast one direction, and between horizontal and a substantial angle oftilt of the order of 30, or more, in the opposite direction; a stillfurther object being to provide means for tiltably supporting a tableentirely on one side thereof, thereby leaving the other side free andunobstructed.

Another important object is to provide a tilting table of the charactermentioned supported on one side only, so that carrying means forradiographic, or other equipment, may be mounted on the table forunhampered adjustment along the opposite, unsupported side of the table.

Another important object is to provide means for mounting a table top ona support base for tilting movement with respect to said base, about atilting axis, in one direction from a normal table position, and fortilting movement, in the opposite direction from such normal position,about an axis spaced from said tilting axis; a further object being toemploy spaced tilting axes as aforesaid, so arranged as to support atable of the order of six feet or more in length at an elevation of theorder of three feet or less above a support door, when horizontal, whileallowing the table to tilt to vertical position, entirely above thefloor, on at least one of said axes.

Another important object is to provide novel tiltable table supportmeans comprising a single, relatively rigid, preferably tubular arm orlink connected at spaced points therein for pivotal movement,respectively, on a support base and on the table, whereby to provide forextensive tilting movement of the table in either direction; a furtherobject being to form the link as a torque tube pivoted on the base andto the table frame at spaced pivots at one side only of the table frame,whereby to support the same rigidly as a cantilever type of structure.

A further object is to utilize spaced tilting pivots in order to providefor substantial tilting of the table in either direction by means of asuitable extensible and contractable actuating device of relativelysmall extension compared with the large tilting movement accomplished,thereby allowing the provision of a neat, compact table structure havingextensive tiltability in either direction.

Another important object is to utilize extensible means connectedbetween the support standard and the tilting table, in order toaccomplish the tilting movement thereof, on the arm or link, whereby theover-all displacement of the extensible means is relatively small incomparison with the tilting movement of the table between tilting limy21,700,135 Patented Jan. 25, 1955 rice its in either direction; afurther object being to utilize an extensible and contractable device,such as a hydraulic piston and cylinder, extensible, from a neutralposition, to tilt the table, on its support base, in one direction froma normal table position, and contractable, from neutral position to tiltthe table in the opposite direction from such normal position.

Another important object is to provide a table structure wherein thetilting mechanism, including the supporting arm or link, is enclosedwithin the frame of the table.

Another important object is to form the table as a framework comprisinghollow, tubular members, and to form the support pedestal, at least inpart, of hollow, sheet metal structural elements in order to provide arigid, relatively light weight pedestal and table structure.

Another important object is to provide a pedestal having its lowerportions cut away in such fashion as to provide toe space for anoperator, thus enabling him to approach the table closely on its supportpedestal side.

Among the other important general objects of the invention is to providea table structure of extreme simplicity, and consequently ofcomparatively low manufacturing cost, which aifords an unusually widerange of tiltability in either direction and which, with all, embodiesunusual rigidity so that the table, even when heavily loaded and tilted,will maintain its load accurately in position for precise radiography.

The foregoing and numerous other important objects, advantages, andinherent functions of the invention will become apparent as the same ismore fully understood from the following description, which, taken inconnection with the accompanying drawings, discloses a preferredembodiment of the invention.

Referring to the drawings:

Fig. l is a side view of table apparatus embodying the presentinventlon;

Fig. 2 is a perspective view of an arm or link forming a part of thetilting structure for connecting the table tiltably on its supportstructure;

Figs. 3 and 4 are sectional views taken substantially along the lines 33 and 4 4 in Fig. l;

Fig. 5 is a sectional view taken substantially along the line 5 5 inFig. 3;

Figs. 6 and 7 are sectional views taken substantially along the lines 66 and 7 7 in Fig. l; and

Fig. 8 is an enlarged sectional View taken through the unsupported sideof the table frame.

To illustrate the invention, the drawings show an adjustable tablestructure 11 particularly well suited for supporting human bodies forexamination, the structure being especially adapted for X-rayexamination and therapy purposes, in that it is tiltably supported formovement between horizontal and various tilted positions in eitherdirection, the table shown, indeed, being tiltable to vertical positionin at least one direction and to a substantial degree of tilt of theorder of 30, or more, in the opposite direction. The table is preferablyappreciably in excess of six feet in length and thus is adapted tosupport a human body thereon at any desired inclination, between thetiltable limits in either direction. The table structure, as willappear, is also well adapted for the support of devices such as screens,diaphragms, cassettes,

-ray sources, and mechanism for the operation and control thereof, whichmay be mounted on the table in any suitable or preferred fashion forlongitudinal and lateral adjustment thereon.

The table structure 11 may conveniently comprise a preferablyrectangular frame l2, a support pedestal 13, a mounting arm or link 14,for mounting the table on the pedestal, and an extensible operatingdevice i5, preferably comprising a hydraulic cylinder 16 and acooperating piston 17, operatively connected between the table and thepedestal for tilting the former with respect to the atter.

As shown, the frame i2 is preferably of hollow, sheet metal constructioncomprising a pair of spaced apart, longitudinally extending members 1Sand i9, rigidly interconnected in spaced relationship by transversebracing and spacing members 20 and 21, said members i8, 19, 29, and 21preferably comprising tubular members of metal, such as steel, havingpreferably rectangular sectional configuration, although it will beapparent that the present invention is not necessarily limited to therectangular sectional shape of the frame members. The frame members, ofcourse, may be secured together in any suitable or convenient fashion,as by welding, whereby to provide an exceedingly rigid, yet relativelyinexpensive frame structure, the preferred box-like character of theframe members affording a structure of unusual rigidity.

The frame member 18, on one side of the frame, is preferablysubstantially deeper than the member 19 forming the opposite side of theframe, the member 18 being preferably of U-shaped sectionalconfiguration, with .a longitudinally extending bracing and spacingplate 22 interconnected between and extending substantially throughoutthe length of the spaced side walls of the member 18. The centralportions of this plate are cut away or omitted to form a gap or opening23 therein at the central portions of the member 18, in order that thetop of the pedestal 13 and the link 14 may extend through and operate insaid opening.

The pedestal 13 preferably comprises an upright member 24 which maycomprise a casting, for strength and rigidity; or it may comprise afabricated sheet metal structure. lts upper end forms a mounting 25 fora suitable bearing 26, such as a needle bearing, while the lowerportions of the upright are formed to rest upon the floor or othersupport base on which the table is to be supported. Adjacent the bearingmounting 25 the upright 24 may provide an upwardly facing shoulder 27,for a purpose hereinafter more fully explained. Beyond this shoulder,from the bearing 26, the upright may be formed with a cavity or recess28', in its forward face, in which the operating device 15 may besupported on the upright for tilting movement on a pivot mounting 28which serves to pivotally support one end of the operating device 15 onthe pedestal.

The arm or link 14 preferably comprises a tubular member 29, provided atone end with a fitting 30 comprising a bearing yoke adapted to pivotallyconnect the arm with the bearing 26, as by means of a bearing pin 31,vwhereby the arm 14 is pivotally supported on and at the top of thepedestal upright 24. Intermediate its ends, the member 14 is providedwith a downwardly extending stop member 32 in position to engage theshoulder 27 of the pedestal upright, in order to limit the movement ofthe arm or link 14 on the bearing 26 in a counterclockwise direction,viewing Fig. 5, the arm preferably occupying substantially horizontalposition on the pedestal when the stop member 32 is in engagement withthe seat 27. The arm 14, at its end remote from the tting 30, isprovided with a fitting 33 adapted to carry a pivot pin 34 for pivotallyconnecting the arm with the table frame 12, the pin 34, to this end,extending at its opposite ends in bearings 35 formed on the spaced wallsof the U-shaped member 18, said bearings being located within thebox-like structure formed by the U-shaped member 18 and thestrengthening plate 22.

The upper portions of the fitting 30 are preferably extended to form abearing plate 36 on the arm 14, in position to engage the inner face ofthe member 18. The table frame 12, thus, is normally supported on thearm at the bearing 35 and at the bearing plate 36. The arm 14, in turn,is normally supported on the pedestal 13 by the bearing 26 and theshoulder 27. Accordingly, the table frame 12 may be supported in anormal, preferably horizontal position, on the pedestal, and may betilted in either direction from such normal position. To this end, theoperating device 15 may be pivotally connected, as at the bearing 26 onthe pedestal upright, and at a bearing 37 on the frame 12, as at one endof the frame member 1S. As shown, the cylinder 16 is pivotally connectedon the bearlirg 28 and the piston 17 is connected at the bearmg Byoperating the device 15 to project the piston 17, from a neutral or restposition, the frame 12 may be tilted in a clockwise direction, viewingFig. l, from the normal horizontal position to a substantially verticalposition shown in dotted lines, the arm 14 during such movement turningon the pedestal 13 at the bearing 26, and moving with the frame 12,without any relative rotation between the arm 14 and the frame 12 at thepivot 34. Even when the table is in vertical position, its weight andthe weight supported thereby will keep the table frame in bearingengagement with the plate 36.

By retracting the piston 17 in the cylinder 16, from its neutralposition, the table frame 12 may be tilted from normal position, in theopposite, or counter-clockwise, direction, to the position shown indashed lines in Fig. 1,' such position in the illustrated embodimentrepresenting a maximum tilt of the order of 30. A greater degree oftilting may, of course, be obtained, if desired, by extending theoperating travel of the device 15. Ordinarily, in tables for X-raypurposes, a 90 tilt in one direction, with a 30 tilt in the other, isadequate for all purposes.

For operative convenience, the support structure is sized to carry thetable, in horizontal position, with its top at an elevation above thesupporting floor of the order of three feet or less, and, in thisconnection, it will be noted that the employment of the spaced pivots 31and 34 allows a table six feet or more in length to be carriedhorizontally, at a convenient, relatively low elevation, and to betilted to the vertical position, on at least one pivot, entirely abovethe supporting oor, while at the same time employing a neat, compactactuating device 18 Vfor tilting the table in either direction, therequired length and operating movement of the device 18 beingsubstantially less than if the table were to be tilted in opposeddirections from horizontal on a single pivot axis. lt will be noted,also, that the table is supported on the pedestal solely by the linkmember 14 at one side of the structure, whereby the table is constitutedas a cantilever structure of exceedingly rigid character due to thebox-like structure of the table frame elements 18, 19, 2l), and 21, andalso to the arrangement of the link 14 as a torque tube. This cantilevertable structure leaves the pedestal remote sides of the table entirelyunobstructed for operational purposes hereinafter more fully explained.

lt will be seen from the foregoing that the frame 12 is supportedentirely from one side thereof upon the pedestal 13, which may, inaddition to the upright 24, comprise a transverse arm 38, preferably ofsheet metal construction. This arm may conveniently comprise a channelmember provided with a ange for attaching it at one end to the lowerportions of the upright 24, as by means of bolts 39. When so attached,the arm 38 may extend beneath the table frame 12 to a point below therear side 19 thereof; and the member 38, at its end remote from theupright 24, may be provided with a flange for attachment, as by means ofbolts 40, with a foot member 41, preferably comprising a hollow, sheetmetal beam of rectangular sectional configuration.

The table frame 12, of course, may carry a top structure, secured to theframe 12 in any suitable or preferred fashion and embodying la panel 42,in position overlying the top of the frame. Immediately beneath thepanel 42, the frame 12 may provide a mounting for a cassette and adiaphragm carriage 43, the same being provided with bearing wheels 44 inposition to ride upon suitable tracks 45 on the frame members 18 and 19,so that the carriage 43 may be shifted to any desired positionlongitudinally of the frame 12.

The frame 12 also may provide support for adjustable frame means 46,said frame 46 being provided with wheels 47 in position to operate intracks 48 extending longitudinally of and carried by the frame members18 and 19. The frame 46, in turn, may carry a sub-frame, or frames, 49supported by suitable roller elements for movement on the frame 46transversely with respect to the table frame 12. This frame 49 may havea portion extending beneath and outwardly of the frame member 19 inposition to carry an upstanding support structure 50 adapted to serve asa mounting for equipment, such as an X-ray source 51. This upstandingmounting 50, the X-ray source and the mechanism for supporting the sameon the mounting 50, may be of any suitable or preferred construction,such as illustrated and described in United States Letters Patent No.2,315,786, issued April 6, 1943, on the invention of Julius I. Grobe,and the carriages 43 and 46 may be suitably counter-balanced to retaintheir position on the frame when the same is tilted by counter-balancingmeans disposed within the hollow table frame 12, in the manner describedin my `co-pending application for United States Letters Patent, SerialNo. 684,650, filed Iuly 19, 1946,

y which issued, October 24, 1950, as United States Patent trol means,also, may be provided for actuating the hydraulic device 15, includingmeans for locking the device Yi to hold the table'in anytilted positionwithin its range, and in its normal or horizontal position. f

The upright 24 may conveniently comprise a hollow structure fabricatedof formed sheet metal plates, welded or otherwise connected together.The upright may extend vertically beneath the table frame member 18, andmay include a foot 52 disposed vertically beneath the bearing 26. Thisfoot portion is preferably sized to it between the side walls of theframe member 18, at the end thereof, when the table is in verticalposition, as shown in dotted lines in Fig. l; and, to this end, thebracing plate 22 may be omitted or cut away, at the end of member 13, toform an opening 53 to receive the foot 52. From said foot to theopposite end of the upright the same is formed to provide a space 54 toreceive the toes of an operator of the table beneath and inwardly of thefront wall of the upright, so that the operator may stand closelyalongside of the table. The end of the upright remote from the foot 52may be provided with an adjustable foot 54 for table leveling purposes,comprising a stem threaded into the upright and adapted to support thesame at a desired elevation above the floor on which the table issupported. This adjustable foot 54' is preferably located substantiallyinwardly of the front face of the upright 24 to avoid interference withthe toes of the operator. Adjustable feet, similar to the foot 54', may,if desired, be provided on the member 41, for leveling, as shown inFigs. l and 6.

The present invention is directed more particularly to the exceedinglysimple and novel arrangement embodying the arm or link 14, which servesas the sole support of the table frame 12 on the pedestal 13, and whichenables the use of a relatively simple and inexpensive, yet readilycontrollable hydraulic ram element for tilting the table in eitherdirection from the horizontal through an unusually wide range or"tilting movement, the structure herein illustrated being tiltablethrough substantially 90 in one direction, and to an inclination 0f 30in the other, a total tilting movement of 120.

lt is thought that the invention and its numerous attendant advantageswill be fully understood from the foregoing description, and it isobvious that numerous changes may be made in the form, construction andarrangement of the several parts without departing from the spirit orscope of the invention, or sacrificing any of its attendant advantages,the form herein disclosed being a preferred embodiment for the purposeof illustrating the invention.

The invention is hereby claimed as follows:

l. A tilting table structure comprising a support base, a table frame, alink pivotally connected, at spaced points therein, respectively to saidsupport base and to said table frame, bearing means for supporting thetable frame on said link remote from the pivotal connection between thelink and frame, and carriage means on and movable longitudinally of saidtable frame.

2. A tilting table structure comprising a support base, a table frameproviding a table top panel, a link pivotally connected, at spacedpoints therein, respectively to said support base and to said tableframe, bearing means for supporting the table frame on said link remotefrom the pivotal connection between the link and frame, carriage meanson and movable longitudinally of said table frame, and penetrating7 rayequipment mounted on said carriage means in position disposed within thevertical projection of the area of said table top panel.

3. A tilting table structure comprising a support base, a table frame, alink pivotally connected, at spaced points therein, respectively to saidsupport base and to said table frame, bearing means for supporting thelink on the base remote from the pivotal connection between the link andbase, and carriage means on and movable longitudinally of said tableframe.

4. A tilting table structure comprising a support base, a table frameproviding a table top panel, a link pivotally connected, at spacedpoints therein, respectively to said support base and to said tableframe, bearing means for supporting the link on the base remote from thepivotal connection between the link and base, carriage means on andmovable longitudinally of said table frame, and penetrating rayequipment mounted on said carriage means in position disposed within thevertical projection of the area of said table top panel.

5. A tilting table structure comprising a support base,

hollow, tubular torque member pivotally connected at one end to thesupport base, and at the opposite end with said table frame, at one sideof said frame, only, whereby to load the link in torsion and therebysupport said table frame, as a cantilever structure, on said base, andcarriage means on and movable longitudinally of said table frame.

6. A tilting table structure comprising a support base, a table frameproviding a table top panel, a frame supporting link comprising ahollow, tubular torque member pivotally connected at one end to thesupport base, and at the opposite end with said table frame, at one sideof said frame, only, whereby to load the link in torsion and therebysupporting said table frame, as a cantilever structure, on said base,carriage means on and movable longitudinally of said table frame, andpenetrating ray equipment mounted on said carriage means in positiondisposed within the vertical projection of the area of said table toppanel.

7. A tilting table structure comprising a support base, a table frame, alink pivotally connected, at spaced points therein, respectively to saidsupport base and to said table frame, bearing means for supporting thetable frame on said link, at a point remote from the pivotal connectiontherebetween, cooperating stops on said link and base for supporting thelink on the base at a point remote from the pivotal connectiontherebetween, and carriage means on and movable longitudinally of saidtable frame.

8. A tilting table structure comprising a support base, a table frameproviding a table top panel, a link pivotally connected, at spacedpoints therein, respectively to said support base and to said tableframe, bearing means for supporting the table frame on said link, at apoint remote i-.om the pivotal connection therebetween, cooperatingstops on said link and base for supporting the link on the base at apoint remote from the pivotal connection therebetween, carriage means onand movable longitudinally of said table frame, and penetrating rayequipment mounted on said carriage means in position disposed within thevertical projection of the area of said table top panel.

9. A tilting table structure comprising a table frame having a hollowmember on one side thereof, a support base having a bearing at its topadapted to be received Within said hollow member, a link extendingwithin said hollow member and pivotally connected at one end on saidbearing and at the other end to said hollow member, and carriage meanson and movable longitudinally of said table frame.

l0. A tilting table structure comprising a table frame providing a tabletop panel and having a hollow member on the side thereof, a support basehaving a bearing at its top adapted to be received within said hollowmember, a lmk extending within said hollow member and pivotallyconnected at one end on said bearing and at the other end to said hollowmember, carriage means on and movable longitudinally of said tableframe, and penetrating ray equipment mounted on said carriage means inposition disposed within the vertical projection of the area of saidtable top panel.

l1. A tilting table structure comprising a table frame having a hollowmember on one side thereof, a support base having a bearing at its topadapted to be received within said hollow member, a link extendingwithin said hollow member and pivotally connected at one end on saidbearing and at the other end to said hollow member, said base having asupporting foot disposed beneath said bearing in position to be receivedwithin said hollow member, at one end of said frame, when said link andtrarne are turned on said bearing, and carriage means on and movablelongitudinally of said table frame.

l2 A tilting table structure comprising a table frame providing a tabletop panel and having a hollow member on one side thereof, a support basehaving a bearing at its top adapted to be received within said hollowmember, a link extending within said hollow member and p1votal1yconnected at one end on said bearing and at the other end to said hollowmember, said base having a supporting foot disposed beneath said bearingin position to be received within said hollow member, at one end o fsaid frame, when said link and frame are turned on said bearing,carriage means on and movable longitudinally of said table frame, andpenetrating ray equipa table frame, a frame Supporting link comprising ament mounted on said carriage means in position disposed within thevertical projection of the area of said table top panel.

13. A tilting table structure comprising a support base, a table frame,a mounting member for connecting the frame for tilting movement withrespect to said base, spaced apart frame and base pivots connecting saidmember respectively with the frame and the base, whereby said frame maytilt with respect to the mounting member and the base, in onel directionfrom a normal position, about the axis of said frame pivot, and,together with the mounting member, may tilt in the opposite directionfrom said normal position, about the axis of the base prvot, andcarriage means on and movable longitudinally yof said table frame.

14. A tilting table structure comprising a support base, a table frameproviding a table top panel, a mounting member for connecting the framefor tilting movement with respect to said base, spaced apart frame andbase pivots connecting said member respectively with the frame and thebase, whereby said frame may tilt with respect to the mounting memberand the base, in one4 direction from a normal position, about the axisof said frame pivot, and, together with the mounting member, may tilt inthe opposite direction from said normal position, about the axis of thebase pivot, carriage means on and movable longitudinally of said tableframe, and penetrating ray equipment mounted on said carriage means inposition disposed within the vertical projection of the area of saidtable top panel.

15. A tilting table structure comprising a support base, a table frame,a link having pivotal connection respectively with said base and withsaid frame whereby to support said link and frame, respectively, fortilting movement on the base and on the link, on tilting axes spacedapart on said link, frame carrying means for supporting said frame onsaid link substantially at the pivotal connection of the link on thebase, whereby the table frame may rest on said link substantially atsaid spaced axes, and carriage means on and movable longitudinally ofsaid table frame.

16. A tilting table structure comprising a support base, a table frameproviding a table top panel, a link having pivotal connectionrespectively with said base and with said frame whereby to support saidlink and frame, respectively, for tilting movement on the base and onthe link, on tilting axes spaced apart on said link, frame carryingmeans for supporting said frame on said link substantially at thepivotal connection of the link on the base, whereby the table frame mayrest on said link substantially at said spaced axes, carriage means onand movable longitudinally of said table frame, and penetrating rayequipment mounted on said carriage means in position disposed within thevertical projection of the area of said table top panel.

17. A tilting table structure comprising a relatively wide uprightmember of restricted thickness providing a base having appreciablespread in the direction of its width, pivot means formed in the upperportions of said base, a table frame comprising a hollow longitudinallyextending channel member adapted to receive and enclose the upperportions of said base, pivot means on and extending within said channelmember, a link extending in said channel member and having pivotalconnection, respectively, with said pivot means on the base and withsaid pivot means on the channel member, whereby to support said link andframe respectively for tilting movement on said base and on the link, ontilting axes spaced apart on said link, and carriage means on andmovable longitudinally of said table frame.

18. A tiltingtable structure comprising a relatively wide upright memberof restricted thickness providing a base having appreciable spread inthe direction of its width, pivot means formed in the upper portions ofsaid base, a table frame providing a table top panel and comprising ahollow longitudinally extending channel member adapted to receive andenclose the upper portions of said base, pivot means on and extendingwithin said channel member, a link extending in said channel member andhaving pivotal connection, respectively, with said pivot means on thebase and with said pivot means on the channel member, whereby to supportsaid link and frame respectively for tilting movement on said base andon the link, on tilting axes spaced apart on said link, carriage meanson and movable longitudinally of said table frame, and penetrating rayequipment mounted on said carriage means in position disposed within thevertical projection of the area of said table top panel.

19. A tilting table structure comprising a relatively wide uprightmember of restricted thickness providing a base having appreciablespread in the direction of its width, pivot means formed in the upperportions of said base, a table frame comprising a hollow longitudinallyextending channel member adapted to receive and enclose the upperportions of said base, pivot means on and extending within said channelmember, a link extending in said channel member and having pivotalconnection, respectively, with said pivot means on the base and withsaid pivot means on the channel member, whereby to support said link andframe respectively for tilting movement on said base and on the link, ontilting axes spaced apart on said link, said link comprising a torquetube between said spaced apart axes to rigidly support said table framein cantilever fashion, on one side thereof, and carriage means on andmovable longitudinally of and beneath said table frame, said carriagemeans including portions extending upwardly of said table frame f at theside thereof remote from said link.

20. A tilting table structure comprising a relatively wide uprightmember of restricted thickness providing a base having appreciablespread in the direction of its width, pivot means formed in the upperportions of said base, a table frame providing a table top panel andcomprising a hollow longitudinally extending channel member adapted toreceive and enclose the upper portions of said base, pivot means on andextending within said channel member, a link extending in said channelmember and having pivotal connection, respectively, with said pivotmeans on the base and with said pivot means on the channel member,whereby to support said link and frame respectively for tilting movementon said base and on the link, on tilting axes spaced apart on said link,said link comprising a torque tube between said spaced apart axes torigidly support said table frame in cantilever fashion, on one sidethereof, carriage means on and movable longitudinally of and beneathsaid table frame, said carriage means including portions extendingupwardly of said table frame at the side thereof remote from said link,and penetrating ray equipment mounted on said carriage means in positiondisposed within the vertical projection of the area of said table toppanel.

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